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| author | Bill Wendling <isanbard@gmail.com> | 2010-07-15 23:32:40 +0000 |
|---|---|---|
| committer | Bill Wendling <isanbard@gmail.com> | 2010-07-15 23:32:40 +0000 |
| commit | e9bf7e692e56656ef13b33af86624d0fdcd578fb (patch) | |
| tree | 2cb585a3c4d0fbf8bb51f00db689241d03af0ad0 /lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h | |
| parent | 60108e96bbc5432f4fe06ba313e64448e97a0e15 (diff) | |
| download | llvm-e9bf7e692e56656ef13b33af86624d0fdcd578fb.tar.gz llvm-e9bf7e692e56656ef13b33af86624d0fdcd578fb.tar.bz2 llvm-e9bf7e692e56656ef13b33af86624d0fdcd578fb.tar.xz | |
Handle code gen for the unreachable instruction if it's the only instruction in
the function. We'll just turn it into a "trap" instruction instead.
The problem with not handling this is that it might generate a prologue without
the equivalent epilogue to go with it:
$ cat t.ll
define void @foo() {
entry:
unreachable
}
$ llc -o - t.ll -relocation-model=pic -disable-fp-elim -unwind-tables
.section __TEXT,__text,regular,pure_instructions
.globl _foo
.align 4, 0x90
_foo: ## @foo
Leh_func_begin0:
## BB#0: ## %entry
pushq %rbp
Ltmp0:
movq %rsp, %rbp
Ltmp1:
Leh_func_end0:
...
The unwind tables then have bad data in them causing all sorts of problems.
Fixes <rdar://problem/8096481>.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108473 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h')
| -rw-r--r-- | lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h index 46733d6db1..86216375a5 100644 --- a/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h +++ b/lib/CodeGen/SelectionDAG/SelectionDAGBuilder.h @@ -385,7 +385,7 @@ private: void visitBr(const BranchInst &I); void visitSwitch(const SwitchInst &I); void visitIndirectBr(const IndirectBrInst &I); - void visitUnreachable(const UnreachableInst &I) { /* noop */ } + void visitUnreachable(const UnreachableInst &I); // Helpers for visitSwitch bool handleSmallSwitchRange(CaseRec& CR, |